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|• Official||Maithili, Hindi|
|Time zone||IST (UTC+5:30)|
|ISO 3166 code||IN-BR|
|Lok Sabha constituency||Purnia|
|Vidhan Sabha constituency||Kasba|
As of 2001[update] India census, Kasba had a population of 25,522. Males constitute 53% of the population and females 47%. Kasba has an average literacy rate of 49%, lower than the national average of 59.5%: male literacy is 57%, and female literacy is 41%. In Kasba, 18% of the population is under 6 years of age.
It is the oldest district in the state of Bihar . In 1912, Bihar and Orissa were carved as separate provinces out of the old Bengal Province and Purnia became the district of the new provincial unit. Before the state reorganization in 1956, Purnia was contiguous to East Pakistan . The area of this district was about 4239 square miles. Buchanan Hamilton the first historian-geographer of India visited Purnia in 1801-10.
Situated in the North Eastern part of Bihar, Kasba lies between 87.5' Eastern Longitude and 25.8 Degree North Latitude. Covers 0.5% (30 km2) of the state's area. Kasba can be broadly divided into two physiographic units, the Plains and the Plateau. A land endowed with minerals, fertile green fields, peace fallboard force, vast market and a political system committed to industrial growth
- "Census of India 2001: Data from the 2001 Census, including cities, villages and towns (Provisional)". Census Commission of India. Archived from the original on 2004-06-16. Retrieved 2008-11-01.